Ambient vibration testing and structural identification of a cable-stayed bridge

Abstract

The paper presents the results of an experimental and theoretical investigation on the Pietratagliata cable-stayed bridge (Udine, Italy). Ambient vibration tests were performed in order to estimate the dynamic characteristics of the lower vibration modes of the bridge. Structural identification is carried out by means of a manual tuning procedure based on finite element models of increasingly accuracy. The analysis allows to improve the description of boundary conditions and mechanical interaction between the bridge components. Results from local dynamic testing are used to estimate the traction on the cables and to assess the integrity of the suspending system of the bridge.

Wireless Networks: Characteristics and Applications

“…For comparative purposes, past EMA and FEA dynamic estimations reported in [44] were taken into account for the examined bridge. There, on-site vibration test measurements have been presented to assess the dynamic parameters of the cable-stayed bridge under investigation, including an advanced FEA analysis aimed at further exploring the experimental observations and at assessing the effects of some key input parameters on the overall performance of the bridge (i.e., boundaries, structural detailing, pre-stressing force in the stays, etc.…”

“…To this aim, additional FEA models representative of structural details were presented for a further assessment of boundary conditions effects on the dynamic parameters of the bridge. Refined calibration of major input features was, hence, carried out, by including fine-tuning towards available on-site measurements (see [44]). [44] with permission from Springer Nature, Copyright © license agreement no.…”

“…Refined calibration of major input features was, hence, carried out, by including fine-tuning towards available on-site measurements (see [44]). [44] with permission from Springer Nature, Copyright © license agreement no. 4386400703508 (July 2018).…”

“…4386400703508 (July 2018). 9 Additional local EMA measurements for the natural frequencies of the stay cables were also reported in [44] from ambient vibration tests, and used to identify the axial force on the supporting cables. Based on combined parametric FEA simulations, it was shown that the vibration frequencies of the bridge are not particularly sensitive to these structural modifications, with an average reduction up to 0.5-1% the fundamental frequencies of the reference, undamaged configuration.…”

Live Load Distribution Factors for Skew Stringer Bridges with High-Performance-Steel Girders under Truck Loads

“…The connection between the frame elements and the concrete slabs that they were supporting (shell elements) was provided automatically by the body constraint, vertical rigid links, defined in the CSIbridge software. Due to this assumption, no relative displacements and rotations were allowed between corresponding nodes [28].…”